Here is a current listing of FBO's that offer a fuel discount if you show the A.C.C.'s app. Maybe there is one near you.
Please support these FBO's, they support G.A.
And check back for other FBO's being added to the list.

0J6 Headland, Alabama

E95 Benson, Arizona

KCCB Upland-Cable Airport, California

KGCK Saker at Garden City, Kansas

KHDC Hammond Air in Hammond, Louisiana

6S8 Northern Skies at Laurel, Montana

KPVK Port Lavaca, Texas